LiFePO4 Batteries: An Overview
Compact electronic devices rely on concise li-ion battery packs. Lithium iron phosphate battery (LiFEPO4) or LFP battery is a type of lithium-ion battery that uses lithium iron phosphate as a cathode and a graphitic carbon electrode as the anode.
LFP batteries have a lower operating voltage and also present lower electrical conductivity. But they have some significant advantages over lithium-ion batteries like low toxicity, low cost, high stability, high performance, etc. Due to these advantages, LFP batteries find several roles in automotive industries, Uninterruptible power supplies, and other low power applications.
LFP batteries have a very constant output voltage that stays fixed around 3.2V (nominal voltage of the battery) during discharge cycles. They also have a longer calendar life. Calendar life or shelf life is the time for which a battery can store charge being inactive or with minimal use. Other than that, LFP batteries are thermally and electrically stable, which makes them safer than traditional LiCoO2 batteries.
LFP Power Board
Stefan Wagner from Germany designed a PCB for LFP batteries power board. The board can charge LiFePO4 batteries and also power the load uninterruptedly. The board is developed for 3.3V projects and can be operated by both battery and external power supply.
The board uses CN3058E battery charger IC and HY2112, a battery-pack protection IC. There is a load-sharing system that interrupts the connection between the battery and the load when an external power supply is connected. The load-sharing system is implemented by a pass transistor and a Schottky diode. When an external voltage is detected at the gate of the pass transistor, the voltage from the battery is interrupted.
Read more: LIFEPO4 CHARGER BOARD BASED ON CN3058E